All you can do is keep encouraging her but it's not a good idea to work to a deadline, as all kids are different. What worked with one child won't nescessarily work with the other. If she is showing signs then that is great, but if she isn't then she could dig in her heels and refuse to defy you on purpose.
A new baby really can upset things when you have been travelling along really well.
My three year old TT himself pretty much but since I've had Caleb home he's regressed and has been doing both wee and poo in his jocks. It is getting me down a bit as you can well imagine and I've considered putting him back in nappies when I've been upset with it, especially after having to rinse out his third pair of pooey jocks for the day.